The Spirit Masters Guild comprised of numerous Spirit Masters and they were in charge of managing the affairs of the all the Spirit Masters on the continent. The Spirit Masters were bound by the rules of the guild, however in return, they also gain protection from the guild.
Similarly, all the other professions also have their own guilds. Alchemists had their Alchemists Guild, Armament Masters would have their Armament Masters Guild and Beast Tamer Masters had their Beast Tamer Masters Guild and even the mercenaries had their Mercenaries Guild.
All these guilds worked together and did not work in isolation.
Each guild would be in charge of the different resources and every city's teleportation array would be located at the Spirit Masters Guild.
When Sima You Yue walked into the Spirit Masters Guild, the person inside saw her tattered clothing and immediately felt a deep sense of veneration.